On big trucks the gears are NOT synchronized.So when you double clutch,you push down the clutch,move the stick to neutral,let cluch back out,let engine slow down RPMS,push down clutch,again,and put trans mission in next gear.You are making the gears match speed of the truck,so that it can be shifted.If you dont let the clutch back out after you put it in neutral,you cant shift it because when you push the clutch in,you disconnect the transmission from the engine and it slows down the gears faster than the engine slows down,then you cant shift until you reconnect the transmision to the engine by letting the clutch out again.
Its really nuts.For a long time now,people dont use the clutch.Years ago when they had straight cut gears,not heat treated,you would wear them out by grinding them.So you double clutched everything,cars and trucks.If you wear out hard,heat treated, gears we have now, grinding them,you better quit driving because you arent good at it!
Double clutching,even if it is recommended by transmission companys is just not done.Its not necessary.
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Today's Featured Article - A Lifetime of David Brown Tractors - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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